From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267967AbUHTJCL (ORCPT ); Fri, 20 Aug 2004 05:02:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265099AbUHTI73 (ORCPT ); Fri, 20 Aug 2004 04:59:29 -0400 Received: from mta9.srv.hcvlny.cv.net ([167.206.5.42]:45442 "EHLO mta9.srv.hcvlny.cv.net") by vger.kernel.org with ESMTP id S267737AbUHTI6m (ORCPT ); Fri, 20 Aug 2004 04:58:42 -0400 Date: Fri, 20 Aug 2004 04:58:29 -0400 From: Jeff Sipek Subject: Re: SMP cpu deep sleep In-reply-to: <1092989207.18275.14.camel@linux.local> To: Hans Kristian Rosbach Cc: linux-kernel@vger.kernel.org Message-id: <200408200458.38591.jeffpc@optonline.net> MIME-version: 1.0 Content-type: Text/Plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Content-disposition: inline User-Agent: KMail/1.6.2 References: <1092989207.18275.14.camel@linux.local> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Friday 20 August 2004 04:06, Hans Kristian Rosbach wrote: > While reading through hotplug and speedstep patches > I came to think of a feature I think might be useful. > > In an SMP system there are several cpus, this generates > extra heat and power consuption even on idle load. > Is there a way to put all cpus but cpu1 into a kind of > deep sleep? Cpu1 would have to do all work (including irqs) > of course. With Rusty's Hotplug CPU, a userspace script should be able to do this by cat'ing 1 or 0 into the appropriate sysfs file. Jeff. - -- "If I have trouble installing Linux, something is wrong. Very wrong." - Linus Torvalds -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) iD8DBQFBJb08wFP0+seVj/4RAotfAJ9gvudaaAQbYjSiky78rkkRnlZHAACfb8oR Whj349hrd6ZnUPf27JwjJxY= =mL1E -----END PGP SIGNATURE-----